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Original question:

IWR6843ISK: UART issue with IWR6843 VitalSign

IWR6843ISK: Thermal characteristic of mmwave SOCs and protection

Jonathan Ibera
Prodigy 200 points
Part Number: IWR6843ISK
Other Parts Discussed in Thread: AWR1642, IWR6843

For the mechanical / thermal characteristics of the SOC for either IWR6843 and AWR1642 chips, 

1) Is it ok to run these SOCs for extended time 60min without getting too hot? Right now it is open case, but we are thinking of putting it later inside a small plastic casing.

2) We had couple of AWR and IWRs that died on us and we can't tell the reason, but in software we are getting noisy output (we can't see legitimate data at all). Then, we just order a brand new and it starts to work again. What are the possible reasons AWR/IWR can fail?

2) To be a bit preventative of failures on the heat (finger jumps out when i try to touch it), can we use a little heatsink like this one, https://www.amazon.com/gp/product/B07217N5LS/ref=ppx_yo_dt_b_asin_title_o07_s01?ie=UTF8&psc=1 , the small one dimension is 8.8mm x 8.8mm x 5mm?  I just worry if the heatsink (being metal) can interfere the radar signal ? 

If there is a available mechanical enclosure guide for these SOC/PCBs, please forward me to it for review. 

Thanks,

Jonathan Ibera

  • 0
    TI__Guru 50240 points

    Hi Jonathan,

    I've asked an expert to look into this and we should have an answer for you sometime next week.

     

    Cheers,

    Akash

  • 0 in reply to Akash Gondalia
    TI__Guru 50240 points

    Hi Jonathan,

    Our hardware expert is currently unavailable but we should have a response for you the week of 23 December.

     

     

    Cheers,

    Akash

  • 0 in reply to Akash Gondalia
    TI__Mastermind 25835 points

    Hi Jonathan,

       For the extended period of operation we need to ensure device junction temperature doesn't  exceed 105Dec C for Industrial part and 125 Deg C for automotive parts. 

    You could use below function or API – to read the junction temperature.

    mmwaveLink_getTemperatureReport()  

    rlRfGetTemperatureReport()

    If the junction temperature exceeds above limits then we have to use the other knobs to reduce the temperature (Such as duty-cycle, Heat-sink options etc)

    2) For the heat-sinking purpose: As you rightly pointed out, if not chosen correctly then it would start interacting with the Antenna. 

    In the above suggested heat-sink Fins are protruding out and at that height it might start interacting with the Antenna. It may be good to look at smaller height heatsinks. 

    For the enclosure, Also known as Radome you may want to review below application note section 5.

    TI mmWave Radar sensor RF PCB Design, Manufacturing and Validation Guide (http://www.ti.com/lit/an/spracg5/spracg5.pdf)

    Thanks and regards,

    CHETHAN KUMAR Y.B.